Ok so after running the info through a few translators
I've been able to work out a few things
Tim welcome can be used with the tim viaggio pass, however this only last for 7 consecutive days from first use, so I would need to activate it twice (which is also allowed)
But on the tim welcome page it states to viaggio pass is 10€ for 250m, 250sms, and 500mb and if you click the link it takes you to the viaggio pass page which says its 15€ for 300m,300sms, and 500mb??
So I'm still a little confused?
If anyone can clear this up I would really appreciate it